Freelance M_ANA Hyst
Hello:
Does anyone know how to calculate de Hysterisis value for a H or L alarm?
Is it in percentage of the range? Because I have test it and it seems to me that the Hyst value is a % on the alarm setpoint. Is this correct? How can I do to have the same hysterisis value in all the allarms? For example 1% of the meassuring range.
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Yes you are right.
The Hyst value is % of the alarm setpoint.
The problem is for example an alarm value from zero will have no hysterese :-(
if you want the messuring range as basis for the hyst, you have to calculate
every alarm hyst.
For example range 0-100%; alarm 25 %
Hyst 1% of range = 100/25 * 1% = 4% Hyst
Answers
Dear raudales,
the Hyst. setting is in percentage of the limit value, not the measuring range.
If your measuing range is from 0..200 and the limit is 150, then a Hyst of 0.1 means a hysteresis of 15, which means the value has to go back below 135 in order to show the alarm as gone and create a new alarm once it reaches 150 again.
If you want 0.1 for every hyst. value in an M_ANA you could either use the Bulk-Data manager, or keep a properly configured M_ANA in a program in the pool and copy it from there whenever you need one.
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